Has the max data rate changed while connected to the test socket?
No. It does not change.
Why would an engineer need to call? My previous service was fine at 14/15mbs. And the connection to the test socket would seem to suggest that it is not the internal wiring at fault?
As your service was only connected yesterday, your line is still stabilising so we're unable to send a fault to our suppliers for investigation just yet in this case.
That being said, if your speed hasn't improved after 10 days or indeed it get drammatically worse, please post back and we'll be happy to look into this further for you.
Thanks @Webby. I agree that if it doesn't improve we'll definitely need to investigate this. Unfortunately the suppliers will not accept this as a fault at present as the service was only activated with us two days ago.
The reason I reported the speed issue was because, as Webby says, stabilisation is quite different from a significant shortfall in performance. I would imagine that stabilisation is simply a tweaking of performance, similar to what I have expereinced several times with standard broadband switches. And there is nothing in the order confirmation email from BT saying that you should wait until the end of the stabilisation period before reporting speeds which fall below - in my case - 30mbs.
I have this morning spent most of my time switching locations and testing all over the house. However, since the dual ADSL/phone socket replaced the master some years ago, I can only connect to that master anyway!
I have managed to run through the BT fault testing process and the result was that there appears to be a fault outside the home and an engineer will be asigned to check that within 3 days.
Some more history. This area has only recently switched to fibre. It was late in the rollout as we were Exchange Only (direct) connections. Much work has been required to get the service in here and I would not at all be surprised that there are network issues.
My reluctance in requesting a BT engineer is obvious. The cost is prohibitive and I am not comfortable allowing that to happen simply because there 'may' be an domestic fault. It appears to me that the charge can escalate significantly from the £130 call-out. Furthermore, my experience of BT when it comes to recommending engineer visists is not good. Not that long ago I had to refuse one entry to my home because BT had sent him to fix a problem relating to an o2 text server issue!!!! There was no way that he was ever going to discover anything inside my home that would resolve that particular problem, but it may well have charged a small fortune tell me that!
There's the most likely reason for your problem (practically guaranteed).
Report a line fault not a broadband one on 151.